Parallel-connected generators.



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No. sssxm. PATENTED AUG. 20, 1907.

B. J. .BERG.

PARALLEL CONNECTED GENERATORS.

APPLIUATIOH rn-nn Inf. 1?. 1901.

witne e Inventor Artt'y.

. divide the load equally with the other generators under nected in israiiei, prime movers therefor navirig riitrereng 70 1 N TED STATES PATENT EFICE r ERNST LBERG, OF soHENEoTADY, NEW YORK, ASSIGNOR TO GENERAL ELECTRIC COMPANY, A CORPORATION or NEW YORK.

PARALLEL-CONNECTED GElNERATORS.

' No. 863,774. Specification of Letters Patent. 4 Patented Aug. 20, 1907- Application filad arm 17, 1997. Burial no. 352.7 14

- wkomit may ooncan: windings, has a series winding a, which opposes the Be it known that I, ERNST I. BERG, a citizen of the -magnetization produced by the shunt-winding a and "United States, residing at Schenectady; county of the series winding (1. This winding a is shunted by a. 65 Schenectady, State of New York, have invented cerreactive coil E, which normally carries the greater part tain-new and useful Improvements in Parallel-Com of the current, so'thavt i-he winding a normally haslittle nectedGeneratora'pfwhichme foiiowingiaaspccificaeffect; but upon a sudden increase of load, such as 'tion; I would occur uponashort cireuit, the self-inductance of I My invention'relaitea to electric generiiors connected the coil E forces the'greater part of the current through 60 infpnrnllel, and driven byprime movers oi-diiferent the winding (1, which'producs a weakening of the speed-regulation characteristics, or having different field of generator A, as compared with the field-strength o self-inductions. i of the other generators, so that the generator Ajs pre- 4 fwhen a turbine-driven generator is operated in parvented from taking the greater part of the overload, and; nliei withgneraiorsdriven 'by reciprocating engines, time is given for the circuit-breaker (not shownlto dia- '65 1 thdiirhinedrivenienerntor ordinarily inns-8. better connect the bus-barn Bimin'theline. P 'W- i PP"ff m 9i its W9 i5 What I claim asnew and desire to secure by'Lettern Bddeaigned-thatit ha''a. smaller heif-induetiom The p f a United States-i I turbine driven generator y be compounded 35 m 1. In combination with s plurality of genehotors conordina -lo dl m-i fio b t ipon th -1 g speed-regulation characteristics, and means for prwucinx I j automatically 0. relative decrease in the field-strength 0t shomucmt or hevy overload the turbm w the generator having the best speed regulation upon a, Iud- 1 genemwll'takes the greater MP the g jr b den increase or iond on the generators. t cause of its better Speed-regulation and its lower seli- 2. Iii-combination with a plurality or compound-wound '75 induction, 8011183 it may .be damaged by excessive generators connected in parallel, prime movsr's theretot' I Bi 1 1] having diii'erent speed-regulation characteristic; and gtiflqylbgfqrg't-hg kerm-ssnee j means operative upon a sudden increase in iosd tor pro- 13 Sf W ducing a decrease 'inthe series fleld-strength o! the genep i o o j f my ven i ni pr v t the p porator having the but speed-regulation relative to theserles 80 tionateinciease of load on the turbinedriven generator t t l of the other frq fi ,t 4

m' 3. in comb nation with a p ura -o generators conon hog-1.: and I mpomplmh P prowdl ng nected Iii parallel, prime movers t he ritor having diiieren't automatic mum for reducmg the rehuve Qtrengm of "speed-regulation characteristics, a series field winding I fi thesenemoruponuudden opposing the main field magnetization in the generator Momjpedfimn a d I r id a i gmvi di having the best epeed-reguizition, and a reactive coil shunt posing lng said winding.

mg W co 0mm nected in parallel, prime movers therefor having diil'erent wmdmg onlywmall P of lp I[f(k}d-|';,'iililllflh characteristics, a series iieidwindin'g tor 9 35 but on I. sudden increase of load, the self-induction or rh'e igenernior with the best s eed-regulation having two .4 the reactive coil causes the greater part of the current 9 lmiwmir W B lield ruugnei'imtion,nnd means for increasing the properthrough the f' fiem wfndmg gentionute Strength of the 'u'eaker portion upon a sudden inemtor; thereby momentarliy reducing the generator Hagen mi field strength so as to prevent the encn wr from as- 5. 1-. cumlvinniion wmi a plurality 0! generator! ion- 40 mi more h it share f th overload w i "cried in parallel. prime movers therefor having diluent I porn-regulation i-luu-iu-ierisiics. a series field winding (or flfcul-t-bfmkcfumc woven the generator with the best speoql-reguiouon having two 7 My lq i best [w understood by reference opposing portions. the stronger portion assisting the main the accompanying '(ltilWii'igM'liich shows diagniimmtlield uuzgiwiizzliinil, and a reactive coil shunting tile icaliy three lxlralli-kxlvnnected generators, arranged in \Wlker i I I m f t t a: t a in cum r not on, n p ura y n genera era 0 eren 45 acmrdauce i my x self-inductions connected in paruiiel, and means [or pm- In the drawing i fepmsent the matures during automatically relative decreue in the fleidof three eneraioni connected in araiiel to the busstrength 0 tile generator imving the least'selt-induction 8 P bars I}, Faeh genbraiorhas a main shunt-field a, and :1. P9 a-sfldden luflli I I 7. in combination, a plurality of compound-wound gensums field mmpoundmg The A waters of different self-inductions connected in parallel,

50 drivejn by mum i while the P and means operative upon a sudden increase of load (or c r y mlpmcaimg engwes The producing a relative decrease oi field-strength in the gem .turbine-driven generator, in addition to the usual mt hav t tn u d 8. In comblnatlon, i plurality of gefieratora at dltfereot nli-lnlqctlons conpected 11: parallel, the generator ofleast self-Induction buying a Jen-lea field wlndlng oppolllugthe 11mm laid m'ngnetlntlou, anda reactlv'e coll shuntlng lald inding.

9. A'dlre ct-Imrrent generator comprlslng a set-lea lleld windlng opposing the mnln neld mngnp'tlmtlon, and a reactive coll nhuntlug uld field.

10. Admt'qurrent generator comprlnlnx a serles fleld winding lmvlng two opposlng ortlons, th'e' stronger pm-' Mon n'sslatlng the mall; field magnetlmtlon, and a reactlve coll shunting the weaker portion.

In witness whereof. I have hereunto 15th dy 0t Janoary, 1907.

set my hand thls ERNST J. BERG. Wltoeusea:

BENJAMIN B. HULL, HELEN Oarono. 

